security-advisories
by Nextcloud
Source repositories
- https://github.com/nextcloud/security-advisories
- https://github.com/nextcloud/server
- https://github.com/nextcloud/android
- https://github.com/nextcloud/desktop
- https://github.com/nextcloud/ios
- https://github.com/nextcloud/spreed
- https://github.com/nextcloud/deck
- https://github.com/nextcloud/calendar
- https://github.com/nextcloud/mail
- https://github.com/nextcloud/talk-android
- https://github.com/nextcloud/notes
- https://github.com/nextcloud/text
- https://github.com/nextcloud/contacts
- https://github.com/nextcloud/richdocuments
- https://github.com/nextcloud/groupfolders
- https://github.com/nextcloud/tables
- https://github.com/nextcloud/user_oidc
- https://github.com/nextcloud/circles
- https://github.com/nextcloud/guests
CVEs (233)
| CVE | Vendor / Product | Sev | Risk | CVSS | EPSS | KEV | Published | Description |
|---|---|---|---|---|---|---|---|---|
| CVE-2023-25821 | Med | 0.37 | 5.7 | 0.01 | Feb 25, 2023 | Nextcloud is an Open Source private cloud software. Versions 24.0.4 and above, prior to 24.0.7, and 25.0.0 and above, prior to 25.0.1, contain Improper Access Control. Secure view for internal shares can be circumvented if reshare permissions are also given. This issue is… | ||
| CVE-2022-24838 | Med | 0.37 | 5.3 | 0.33 | Apr 11, 2022 | Nextcloud Calendar is a calendar application for the nextcloud framework. SMTP Command Injection in Appointment Emails via Newlines: as newlines and special characters are not sanitized in the email value in the JSON request, a malicious attacker can inject newlines to break out… | ||
| CVE-2021-32727 | Med | 0.37 | 5.7 | 0.01 | Jul 12, 2021 | Nextcloud Android Client is the Android client for Nextcloud. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.16.1, the Nextcloud Android client skipped a step that involved the client… | ||
| CVE-2023-28643 | Med | 0.36 | 5.5 | 0.01 | Mar 30, 2023 | Nextcloud server is an open source home cloud implementation. In affected versions when a recipient receives 2 shares with the same name, while a memory cache is configured, the second share will replace the first one instead of being renamed to `{name} (2)`. It is recommended… | ||
| CVE-2021-32801 | Med | 0.36 | 5.5 | 0.00 | Sep 7, 2021 | Nextcloud server is an open source, self hosted personal cloud. In affected versions logging of exceptions may have resulted in logging potentially sensitive key material for the Nextcloud Encryption-at-Rest functionality. It is recommended that the Nextcloud Server is upgraded… | ||
| CVE-2025-66557 | Med | 0.35 | 5.4 | 0.00 | Dec 5, 2025 | Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. Prior to 1.14.6 and 1.15.2, a bug in the permission logic allowed users with "Can share" permission to modify the permissions of other… | ||
| CVE-2025-66512 | Med | 0.35 | 5.4 | 0.00 | Dec 5, 2025 | Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Server Enterprise prior to 31.0.12 and 32.0.3, a missing sanitization allowed malicious users to circumvent the content security policy when a malicious user manages to trick a user it viewing an… | ||
| CVE-2022-31131 | Med | 0.35 | 5.4 | 0.01 | Jul 6, 2022 | Nextcloud mail is a Mail app for the Nextcloud home server product. Versions of Nextcloud mail prior to 1.12.2 were found to be missing user account ownership checks when performing tasks related to mail attachments. Attachments may have been exposed to incorrect system users.… | ||
| CVE-2022-31014 | Med | 0.35 | 5.4 | 0.03 | Jul 5, 2022 | Nextcloud server is an open source personal cloud server. Affected versions were found to be vulnerable to SMTP command injection. The impact varies based on which commands are supported by the backend SMTP server. However, the main risk here is that the attacker can then hijack… | ||
| CVE-2021-41239 | Med | 0.35 | 5.3 | 0.01 | Mar 8, 2022 | Nextcloud server is a self hosted system designed to provide cloud style services. In affected versions the User Status API did not consider the user enumeration settings by the administrator. This allowed a user to enumerate other users on the instance, even when user listings… | ||
| CVE-2021-37629 | Med | 0.35 | 5.3 | 0.01 | Sep 7, 2021 | Nextcloud Richdocuments is an open source collaborative office suite. In affected versions there is a lack of rate limiting on the Richdocuments OCS endpoint. This may have allowed an attacker to enumerate potentially valid share tokens. It is recommended that the Nextcloud… | ||
| CVE-2021-32766 | Med | 0.35 | 5.3 | 0.01 | Sep 7, 2021 | Nextcloud Text is an open source plaintext editing application which ships with the nextcloud server. In affected versions the Nextcloud Text application returned different error messages depending on whether a folder existed in a public link share. This is problematic in case… | ||
| CVE-2021-32741 | Med | 0.35 | 5.3 | 0.01 | Jul 12, 2021 | Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, there was a lack of ratelimiting on the public share link mount endpoint. This may have allowed an attacker to enumerate potentially valid share tokens. The issue… | ||
| CVE-2021-32705 | Med | 0.35 | 5.3 | 0.02 | Jul 12, 2021 | Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, there was a lack of ratelimiting on the public DAV endpoint. This may have allowed an attacker to enumerate potentially valid share tokens or credentials. The… | ||
| CVE-2021-32703 | Med | 0.35 | 5.3 | 0.02 | Jul 12, 2021 | Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, there was a lack of ratelimiting on the shareinfo endpoint. This may have allowed an attacker to enumerate potentially valid share tokens. The issue was fixed in… | ||
| CVE-2023-25818 | Med | 0.34 | 5.3 | 0.01 | Mar 27, 2023 | Nextcloud server is an open source, personal cloud implementation. In affected versions a malicious user could try to reset the password of another user and then brute force the 62^21 combinations for the password reset token. As of commit `704eb3aa` password reset attempts are… | ||
| CVE-2023-22472 | Med | 0.34 | 5.3 | 0.00 | Jan 9, 2023 | Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. It is possible to make a user send any POST request with an arbitrary body given they click on a malicious deep link on a Windows computer. (e.g. in… | ||
| CVE-2025-47792 | Med | 0.33 | 5.0 | 0.00 | May 16, 2025 | Nextcloud Desktop is the desktop sync client for Nextcloud. In versions of Nextcloud Desktop prior to 3.15, 3rdparty applications already installed on a user machine can create link shares for almost all data via the socket API. These shares can then be easily sent off to an… | ||
| CVE-2022-29159 | Med | 0.33 | 5.0 | 0.01 | May 20, 2022 | Nextcloud Deck is a Kanban-style project & personal management tool for Nextcloud. In versions prior to 1.4.8, 1.5.6, and 1.6.1, an authenticated user can move stacks with cards from their own board to a board of another user. The Nextcloud Deck app contains a patch for this… | ||
| CVE-2025-66511 | Med | 0.31 | 4.8 | 0.00 | Dec 5, 2025 | Nextcloud Calendar is a calendar app for Nextcloud. Prior to 6.0.3, the Calendar app generates participant tokens for meeting proposals using a hash function, allowing an attacker to compute valid participant tokens, which allowed them to request details and submit dates in… |
- risk 0.37cvss 5.7epss 0.01
Nextcloud is an Open Source private cloud software. Versions 24.0.4 and above, prior to 24.0.7, and 25.0.0 and above, prior to 25.0.1, contain Improper Access Control. Secure view for internal shares can be circumvented if reshare permissions are also given. This issue is…
- risk 0.37cvss 5.3epss 0.33
Nextcloud Calendar is a calendar application for the nextcloud framework. SMTP Command Injection in Appointment Emails via Newlines: as newlines and special characters are not sanitized in the email value in the JSON request, a malicious attacker can inject newlines to break out…
- risk 0.37cvss 5.7epss 0.01
Nextcloud Android Client is the Android client for Nextcloud. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.16.1, the Nextcloud Android client skipped a step that involved the client…
- risk 0.36cvss 5.5epss 0.01
Nextcloud server is an open source home cloud implementation. In affected versions when a recipient receives 2 shares with the same name, while a memory cache is configured, the second share will replace the first one instead of being renamed to `{name} (2)`. It is recommended…
- risk 0.36cvss 5.5epss 0.00
Nextcloud server is an open source, self hosted personal cloud. In affected versions logging of exceptions may have resulted in logging potentially sensitive key material for the Nextcloud Encryption-at-Rest functionality. It is recommended that the Nextcloud Server is upgraded…
- risk 0.35cvss 5.4epss 0.00
Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. Prior to 1.14.6 and 1.15.2, a bug in the permission logic allowed users with "Can share" permission to modify the permissions of other…
- risk 0.35cvss 5.4epss 0.00
Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Server Enterprise prior to 31.0.12 and 32.0.3, a missing sanitization allowed malicious users to circumvent the content security policy when a malicious user manages to trick a user it viewing an…
- risk 0.35cvss 5.4epss 0.01
Nextcloud mail is a Mail app for the Nextcloud home server product. Versions of Nextcloud mail prior to 1.12.2 were found to be missing user account ownership checks when performing tasks related to mail attachments. Attachments may have been exposed to incorrect system users.…
- risk 0.35cvss 5.4epss 0.03
Nextcloud server is an open source personal cloud server. Affected versions were found to be vulnerable to SMTP command injection. The impact varies based on which commands are supported by the backend SMTP server. However, the main risk here is that the attacker can then hijack…
- risk 0.35cvss 5.3epss 0.01
Nextcloud server is a self hosted system designed to provide cloud style services. In affected versions the User Status API did not consider the user enumeration settings by the administrator. This allowed a user to enumerate other users on the instance, even when user listings…
- risk 0.35cvss 5.3epss 0.01
Nextcloud Richdocuments is an open source collaborative office suite. In affected versions there is a lack of rate limiting on the Richdocuments OCS endpoint. This may have allowed an attacker to enumerate potentially valid share tokens. It is recommended that the Nextcloud…
- risk 0.35cvss 5.3epss 0.01
Nextcloud Text is an open source plaintext editing application which ships with the nextcloud server. In affected versions the Nextcloud Text application returned different error messages depending on whether a folder existed in a public link share. This is problematic in case…
- risk 0.35cvss 5.3epss 0.01
Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, there was a lack of ratelimiting on the public share link mount endpoint. This may have allowed an attacker to enumerate potentially valid share tokens. The issue…
- risk 0.35cvss 5.3epss 0.02
Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, there was a lack of ratelimiting on the public DAV endpoint. This may have allowed an attacker to enumerate potentially valid share tokens or credentials. The…
- risk 0.35cvss 5.3epss 0.02
Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, there was a lack of ratelimiting on the shareinfo endpoint. This may have allowed an attacker to enumerate potentially valid share tokens. The issue was fixed in…
- risk 0.34cvss 5.3epss 0.01
Nextcloud server is an open source, personal cloud implementation. In affected versions a malicious user could try to reset the password of another user and then brute force the 62^21 combinations for the password reset token. As of commit `704eb3aa` password reset attempts are…
- risk 0.34cvss 5.3epss 0.00
Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. It is possible to make a user send any POST request with an arbitrary body given they click on a malicious deep link on a Windows computer. (e.g. in…
- risk 0.33cvss 5.0epss 0.00
Nextcloud Desktop is the desktop sync client for Nextcloud. In versions of Nextcloud Desktop prior to 3.15, 3rdparty applications already installed on a user machine can create link shares for almost all data via the socket API. These shares can then be easily sent off to an…
- risk 0.33cvss 5.0epss 0.01
Nextcloud Deck is a Kanban-style project & personal management tool for Nextcloud. In versions prior to 1.4.8, 1.5.6, and 1.6.1, an authenticated user can move stacks with cards from their own board to a board of another user. The Nextcloud Deck app contains a patch for this…
- risk 0.31cvss 4.8epss 0.00
Nextcloud Calendar is a calendar app for Nextcloud. Prior to 6.0.3, the Calendar app generates participant tokens for meeting proposals using a hash function, allowing an attacker to compute valid participant tokens, which allowed them to request details and submit dates in…
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